这个 UIDevice 类别以及观察 UIAccessibilityReduceTransparencyStatusDidChangeNotification 怎么样?
@interface UIDevice (Additions)
@property (readonly) NSString *platform;
@property (readonly) BOOL canBlur;
@end
@implementation UIDevice (Additions)
- (NSString *)platform {
int mib[] = { CTL_HW, HW_MACHINE };
size_t len = 0;
sysctl(mib, 2, NULL, &len, NULL, 0);
char *machine = malloc(len);
sysctl(mib, 2, machine, &len, NULL, 0);
NSString *platform = [NSString stringWithCString:machine encoding:NSASCIIStringEncoding];
free(machine);
return platform;
}
- (BOOL)canBlur {
if(NSStringFromClass([UIVisualEffectView class]) && UIDevice.currentDevice.systemVersion.floatValue >= 8.0 && !UIAccessibilityIsReduceTransparencyEnabled()) {
NSString *platform = self.platform;
CGFloat deviceVersion = [[[platform stringByReplacingOccurrencesOfString:@"[^0-9,.]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, platform.length)] stringByReplacingOccurrencesOfString:@"," withString:@"."] floatValue];
if([platform isEqualToString:@"i386"] || [platform isEqualToString:@"x86_64"]) {
return YES;
} else if([platform rangeOfString:@"iPhone"].location != NSNotFound) {
return (deviceVersion >= 4.1);
} else if([platform rangeOfString:@"iPod"].location != NSNotFound) {
return (deviceVersion >= 5.1);
} else if([platform rangeOfString:@"iPad"].location != NSNotFound) {
return (deviceVersion >= 3.4);
}
}
return NO;
}
不要忘记#include 在你的实现文件中。